I was trying to think of all of Galactus' heralds/former heralds. So far I can think of:
-Morg
-Terrax
-Nova
-Silver Surfer
-Tyrant (though not really a herald, just a creation.)

Are their any others that I' missing? Thanks.

what about Firelord?

Don't forget Air-Walker

....and the Destroyer!

Anyone remember Forbush Man? :o

Wasn't he a herald once?

What about Dazzler? I dunno, I think she just fought him.

Air Walker also had a robot, IIRC. . .

-PJ

There is a famous "what If" where Dazzler becomes the Herald of Galactus.

Don't forget Red Shift
http://www.marvunapp.com/Appendix/redshift.htm

http://www.lowfierce.com/galactus/heralds.html

http://marvelite.prohosting.com/surfer/heralds/